Multi-Tech Systems ISIHP-4SD, ISIHP-4U manual RS-232 Interface Commands, Nn Modulation Handshake

Modem AT Commands & S-Registers

Nn Modulation Handshake

n = 0 or 1 Default: N1

Controls whether the local modem performs a negotiated handshake with the remote modem at connection time when the communication speed of the two modems is different.

N0 enables handshaking only at the communication standard specified by S37 and the ATB command.

N1 always begins the handshake only at the communication standard specified by S37 and the ATB command, but allows fallback to a lower speed as the handshake proceeds. This is the default.

\Tn Inactivity Timer

n = 0 Default: \T0

The inactivity timer specifies the length of time, in minutes, that the modem waits before disconnecting when no data is sent or received. This timer is specified in register S30. The \T0 command disables the inactivity timer.

Yn Long Space Disconnect

n = 0, 1 Default: Y0

When two modems are connected in reliable mode, a link disconnect request packet is sent to request a disconnect. In non-error correction mode, there is no polite way to request a disconnect. As a result, some garbage may be received when a hang-up command is issued.

Y0 disables the modem’s use of the break signal.

Y1 enables long space disconnect.

RS-232 Interface Commands

These commands define how the ISIHP-2S/2U modems use and respond to standard

RS-232 signals.

&Cn Carrier Detect Control

n = 0 or 1

86 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD